Improvement in saw-mills



GEORGE FINNIGAN, OF DUBLIN, IRELAND.

, Leners Patent No. 113,412, dated Apre 4,1871.'

IMPROVEMENT 1N SAW-MILLS.

The Schedule referred to in these Letters Patent and making part; of the same.

for the purpose of opening l large -lcgs xof "round or square timber, and of cuttingthem up into boards and planks of any thickness required.

My improvements-consist `in mounting the bandsaw upon two rollers revolving on Ahorizontal axes, the pulleys or rollers beingplaced on opposite sides of the machine and at the same level or elevation, one pulley being on l each side of thel traveling-table which carries the log or timber to be cut. g

By this arrangement-the endlessisaw, as it passes from one pulley to the other, willvnot only travel .ho'rizontally, but will also cut the timberin a'lateral or horizontaldirection.

I mount ythe rollers in suitable bearings, which are capable of sliding vertically in or'upon the standards or framing of the machine,'and which may be fixed at any desired height therein, so as to render them capable of adjustment to the timber to be cut.

TheV timber maybe supported in any suitableman-l ner; but I prefer to ix itrby dogs to a table pro' videdwith rollers capable 'y of ruiming upon suitable rails.

I giv'c motion to the. band-saw, as heretofore, by a strap or baud passing around a pulley fixed on the axis of one of the drums orrollers around'which the band-saw isstrained, and I take up the slack of such driving-strap or band by means ofaw'eighted roller or other equivalent compensatingmechanism.

By these means I am enabled readily to adjust the saw to the timber, and to fix the latter to the top of a solid table or bench capable of traveling in a horizontal plane, wihile I am enabled also to dispense with the cellar or space which is often required underneath baud-saw machines as heretofore constructed.

In order that my said invention may be more fully understood and readily carried into effect, I will proceed, aided by the accompanying drawing, more fully to describe the same. f

Description of `the Drawing.

Figure 1 is an elevation of band-saw machine constructed according to my invention.

Figure 2 is a horizontal section'o'n thev line aan] lig. 1.

Figure 3 is a horizontalsection on the line y y, fig. l

Like letters indicate the same parts throughout the drawing.

The band-saw a is mounted upon rollers b, placed on opposite sides of the machine, and mounted on horizontal axes b, so as to cause the saw to cut in a ho'rii zontal plane.

'lhe timber to be cut is supported upon the traveling bed or table o, upon which it is fixed by dogs or other equivalent devices.

The axes b1 are carried in bearings bi, which are capable of sliding upon V-pieces df, formed on the standards or frames d.

The bearings b2 are connected together by a crossba or frame, l1, having two guides `or supports, b4, fixed thereto to guide and support the band-saw a close to its work.

Motion is given to the band-saw aby means of a pulley,'b5, mounted on one of the axes b; aud I adjust the saw to its work by means of screws e, which i take into suitable nuts formed in or carried 4by the bearings b2, such screws e being geared together by beveled pinions f fixed onV the shaft or axis j', and taking into beveledpinions e1 xed on the upper ends of the screws e.

In order to lower thesaw I give .motion to the screws" e by means cfa hand-wheel, g1,iixedv on au'axis, y, which also carries a beveled pinion, g, the latter taking into afbeveled pinion, e2, 'xed on the lower end of one of the screws e; butwhen it is desired to raise the saw, for the purpose of fixing a fresh log-Ito -the bed 0r table c, I give-motion to the vshaftor axis g by means of a strap or band, i, which, by means of the fork j, is shifted from the loose-pulleyi1 to the fastpulley i2, the latter having on its axis a toothed pinion, t, which takes into and gives motion to a toothed wheel', gil, iixed on the shaft or axis g. v

If desired, motion may be given to the hedor table c by means vof a screw driven by a strap' or band passing around a cone-pulley iixed thereon; but'if so,.pro vision must be made to stop the table c simultaneously with the saw, if from any cause the lat'ter should cease running. w

The'mode, however, of giving motion 'to the hed c which I have found to answer well is that shown in the drawing, and the following is a description of the Same 2 The bed or table c is supported by rollers c, capable of runningr on iixed rails c2.

On the under side of the bed or table c is fixed a toothed rack, c, which receives motion from a toothed pinion, kl, xed on the shaft or axis lt.

0n one end of the latter is lixed a toothed wheel, k2, which is driven by a toothed wheel, Z, Axed ou one end of the shaft or axis l, whose other end carries a beveled wheel, l?.

When the machine is in the act`of sawing, the wheell2 is driven by a beveled pinion, fm1, keyed on thelower end ofthe shaft or axis m. This shaft oraxis m receives motion from a worm v or screw, be, fixed on one of the'shafts or axes b1 and dtak-mg into a worm-wheel, mz, on the shaft or axis pulley u# to the driving-pulley nl, fixed on onel end of thehollow shaft or axis u2, the other end of which has formed or ixed thereon a beveled.` pinion, 11,3, which takes into and gives motion to the beveled wheel Zz on the shaft or axis I.

Or if it be desired to run 'the bed or table c quickly in the oppositev direction, then the driving-strap or band is shifted to the ,driving-pulley 11,4, fixed on one end of the shaft or axis a5, (passing through the hollow shaft 412,) the other end having Iixed thereon the beveled pinion 'n which gives motion to the beveled pinion l2 in the contrary direction.

, It will be obvious that, when a quick speed is given- 'to the bed or tables in the direction for cutting, the

band-saw willbe raised aboefthe timber fixed on the bed or table c; and in order to change the spcedat .which the bed orut'abie c is drivenvfor cutting, I employ change-wheels of suitable sizes to take the places ofthe toothed wheels kz and Z1, as will be readily `understood.

Having thus. fully described the nature of my invent-ion and the best modewith-which I am acquainted for carrying the same into eiect, I would have it understood that I make no claim to the various parts, separately considered; Vbut What I claim as myiuve'ntion. and desire to secure by Letters Patent, is-e The band-saw a, mounted upon two horizontal rollers', b, and arranged in combination with the bed or table c, and with'the devices for operatingor driving the 'saw and adjusting the same to or away from its work, and with the -inechanisrn for moving the bed or table -in `either direction, and for varying the speed thereof, all substantially as and for the purpose set forth.

GEORGE FINNEGAN. [n s] W'itnesses:

FRANCIS MORGAN, Solicitor,

35 Dawson Street, Dublin; SAML. BLAik,

Clerk to said Francis Morgan. 

